bootsect.h

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    1 /* $FreeBSD$ */
    2 /*      $NetBSD: bootsect.h,v 1.9 1997/11/17 15:36:17 ws Exp $  */
    3 
    4 /*-
    5  * Written by Paul Popelka (paulp@uts.amdahl.com)
    6  *
    7  * You can do anything you want with this software, just don't say you wrote
    8  * it, and don't remove this notice.
    9  *
   10  * This software is provided "as is".
   11  *
   12  * The author supplies this software to be publicly redistributed on the
   13  * understanding that the author is not responsible for the correct
   14  * functioning of this software in any circumstances and is not liable for
   15  * any damages caused by this software.
   16  *
   17  * October 1992
   18  */
   19 #ifndef _FS_MSDOSFS_BOOTSECT_H_
   20 #define _FS_MSDOSFS_BOOTSECT_H_
   21 
   22 /*
   23  * Format of a boot sector.  This is the first sector on a DOS floppy disk
   24  * or the fist sector of a partition on a hard disk.  But, it is not the
   25  * first sector of a partitioned hard disk.
   26  */
   27 struct bootsector33 {
   28         uint8_t         bsJump[3];              /* jump inst E9xxxx or EBxx90 */
   29         int8_t          bsOemName[8];           /* OEM name and version */
   30         int8_t          bsBPB[19];              /* BIOS parameter block */
   31         int8_t          bsDriveNumber;          /* drive number (0x80) */
   32         int8_t          bsBootCode[479];        /* pad so struct is 512b */
   33         uint8_t         bsBootSectSig0;
   34         uint8_t         bsBootSectSig1;
   35 #define BOOTSIG0        0x55
   36 #define BOOTSIG1        0xaa
   37 };
   38 
   39 struct extboot {
   40         int8_t          exDriveNumber;          /* drive number (0x80) */
   41         int8_t          exReserved1;            /* reserved */
   42         int8_t          exBootSignature;        /* ext. boot signature (0x29) */
   43 #define EXBOOTSIG       0x29
   44         int8_t          exVolumeID[4];          /* volume ID number */
   45         int8_t          exVolumeLabel[11];      /* volume label */
   46         int8_t          exFileSysType[8];       /* fs type (FAT12 or FAT16) */
   47 };
   48 
   49 struct bootsector50 {
   50         uint8_t         bsJump[3];              /* jump inst E9xxxx or EBxx90 */
   51         int8_t          bsOemName[8];           /* OEM name and version */
   52         int8_t          bsBPB[25];              /* BIOS parameter block */
   53         int8_t          bsExt[26];              /* Bootsector Extension */
   54         int8_t          bsBootCode[448];        /* pad so structure is 512b */
   55         uint8_t         bsBootSectSig0;
   56         uint8_t         bsBootSectSig1;
   57 #define BOOTSIG0        0x55
   58 #define BOOTSIG1        0xaa
   59 };
   60 
   61 struct bootsector710 {
   62         uint8_t         bsJump[3];              /* jump inst E9xxxx or EBxx90 */
   63         int8_t          bsOEMName[8];           /* OEM name and version */
   64         int8_t          bsBPB[53];              /* BIOS parameter block */
   65         int8_t          bsExt[26];              /* Bootsector Extension */
   66         int8_t          bsBootCode[420];        /* pad so structure is 512b */
   67         uint8_t         bsBootSectSig0;
   68         uint8_t         bsBootSectSig1;
   69 #define BOOTSIG0        0x55
   70 #define BOOTSIG1        0xaa
   71 };
   72 
   73 union bootsector {
   74         struct bootsector33 bs33;
   75         struct bootsector50 bs50;
   76         struct bootsector710 bs710;
   77 };
   78 
   79 #if 0
   80 /*
   81  * Shorthand for fields in the bpb.
   82  */
   83 #define bsBytesPerSec   bsBPB.bpbBytesPerSec
   84 #define bsSectPerClust  bsBPB.bpbSectPerClust
   85 #define bsResSectors    bsBPB.bpbResSectors
   86 #define bsFATS          bsBPB.bpbFATS
   87 #define bsRootDirEnts   bsBPB.bpbRootDirEnts
   88 #define bsSectors       bsBPB.bpbSectors
   89 #define bsMedia         bsBPB.bpbMedia
   90 #define bsFATsecs       bsBPB.bpbFATsecs
   91 #define bsSectPerTrack  bsBPB.bpbSectPerTrack
   92 #define bsHeads         bsBPB.bpbHeads
   93 #define bsHiddenSecs    bsBPB.bpbHiddenSecs
   94 #define bsHugeSectors   bsBPB.bpbHugeSectors
   95 #endif
   96 
   97 #endif /* !_FS_MSDOSFS_BOOTSECT_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/fs/msdosfs/bootsect.h

FreeBSD/Linux Kernel Cross Reference
sys/fs/msdosfs/bootsect.h